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National Instruments Corporation
11
Getting Started with R Series Intelligent DAQ
6.
Right-click the input terminal of the new FPGA I/O Node and select
Create»Control
from the
shortcut menu. Rename the control
AO Voltage
, as shown in the following block diagram.
7.
Save the VI, then right-click
Analog Input (FPGA).vi
in the
Project Explorer
window and select
Compile
from the shortcut menu to recompile the FPGA VI.
8.
Modify the host VI to control the additional AO channel you created by completing the
following steps:
a.
Open the
Analog Input (Host).vi
block diagram.
b.
Place a
Read/Write Control
from the
FPGA Interface
palette between the Invoke method
and the Read/Write Control that already exists on the block diagram.
c.
Wire the
FPGA VI Reference Out
terminal of the Invoke Method node to the
FPGA VI
Reference In
terminal of the new Read/Write Control. Wire the
FPGA Reference Out
terminal of the new Read/Write Control to the
FPGA VI Reference In
terminal of the
existing Read/Write Control.
d.
Wire the
error out
output of the Invoke Method node to the
error in
input of the new
Read/Write Control. Wire the
error out
output of the new Read/Write Control to the
error in
input of the existing Read/Write Control.
e.
Click the section labeled
Unselected
and change it to
AO Voltage
.
f.
Right-click the
AO Voltage
terminal and select
Create»Control
, as shown in the following
block diagram.
